I don't know how you use your DDE card for the HDDR, but I do remember reading it is only good for the 9:30 show, which is too late for me to eat. Thought I'd mention it.
No...you do not need the card when ordering. I called for the HDDR and said, "I have the Disney Dining Experience." He said okay and applied the 20% discount, then charged my card. It came to $80 and change. (A good deal for 2 people). He said you will need to present the card (or letter) when picking up your tickets and if you can't present either, you will be charged the remaining balance. Hope this helps!
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